Research on microstructure and mechanical properties in warm rolling medium manganese steel with ultrafine grain

详细信息    查看全文 | 下载全文 | 推荐本文 |

• 作者：CAO JialiZHAO AiminHUANG YaoZHENG Honghong
• 会议时间：2013-06-01
• 关键词：medium manganese steel ; warm rolling ; reverted austenite ; strengthening mechanism ; mechanism of plasticity improvement
• 作者单位：National Engineering Research Center for Advanced Rolling Technology,University of Science and Technology Beijing,Beijing 100083,China
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

The microstructures and the mechanical properties of the medium manganese steel experienced warm rolling and annealing are investigated.And the transformation of reverted austenite in the steel is investigated by means of tensile testing in stages,scanning electron microscopy ( SEM) and X -rays diffraction ( XRD).It is shown that warm rolling and annealing after the hot rolling result in more reverted austenite,and excellent mechanical properties are gained with 859 MPa strength and 36% elongation.In the earlier stage of tensile deformation,serrate flow stress behavior is obviously observed because of the sustained TRIP effect produced by reverted austenite.And in the later stage of tensile deformation,serrate flow stress behavior disappeared.The ultrafine grain ferrite and martensite produce plastic deformation,and dislocation strengthening in the martensite becomes the main strengthening mechanism.